a) 6×3+6×7 = 18+42=60
8×5+8×4= 32+40=72
7×6+7×3= 42+21=63
b) 9×2+4×2= 18+8=26
6×5+5×5=30+25=55
4×6+6×6=24+36=60
Sper că te-am ajutat!!!! :D
